Nonshattering glass and method of making the same



are colorless and closely and securely Patented June 6, 1933 rwnr os'rnomummmr m 103k, a.

Y, ABSIGNOB, BY IESNE ASSIGNHENTB, T0

m NLUGATUOK GEEIICAL OOIPANY, O1 NLUGLTUCK, CONNECTICUT, A CORPO- roman-mama ems aim irmon or name m sum Io Drawing. Application fled February 15, me,

This invention is an improvement nonshattering glass and methods of making the same, and more particularly in glass strongly resistant to stresses of every character, and especially to those tending to separate the fra ments when the glass is broken.

lass sheets of usual construction are rela tively fragile, and tend to disintegrate into fra ments when broken. The 7 same stress WlllCh breaks the glass tends to drive the fragments apart from which injury frequently results to persons or to objects near the breaka e.

The olymers of phenyl-acrylic acid esters, their I omologues and analogues display plastic properties, and in pure condition they as transparent as mineral glass, and display a high refractive index. This condition of clear colorless transparency is permanent, even after many years exposure to direct sunlight. r

The homologues and analogues may be obtained b heating the corresponding monomer. T us, in particular, they may be obtained from amyl, amylene, iso hopyl, butylens, and isobutylene esters of p eny -acrylic ac1 Polymerization may be carried out b exposure of the esters to light, either sun ight or that of a mercury lamp, convenient method of obtaining the polymers is by adding to the esters a liquid in which its polymers have the roperties to dissolve or to swell and then subjecting said mixture to the sunlight or the ultra violet rays. As a suitable hquid one can use ethylene bromide diphenylmethan, etc. One can add such a liquld ester bejore the polymerization of given'esters of phenylacrylic acid or polymer. 'i

Or the process of polymerization may be left incomplete, in which case, of course, the corresponding monomers are present, and a physically homogeneous amorphous mass results, as transparent as glass, entirely colorless, and possessing the property of adhering to the surface of mineral glass.

The polymerized esters .so treated are utilized by covering a sheet of mineral glass with or by heating. A

chlor-benzol,

Serial no. 254,814. lencwed 0mm 2?, 1932.

a coating of the polymers and aiterwardsv superposmg upon the first sheet asecond sheet with pressure, if desired. Further sheets of glass may be added in the same manner if more than two thicknesses of glass is desired.

When anfincompletely polymerized phenylacrylic acid ester is used, prolonged exposure to sunlight will convert the remaining monomer, for the greater part, into the corresponding polymer.

Ema/mp1s 1 Onto'a sheet of glass of suitable area, and approximately 0.2 cm. thick, a layer of amylen-ester of polymerized phenyl-acrylic acid of suitable consistency is poured continuously and carefully, and as evenly as ossible, so as to cover the whole of the surace. A art of the liquid contents of the mass is a owed to evaporate 10 leaving the air or a suitable to twelve hours. olymers is carefull sheet open to the access of period, say from two Thereafter the layer of y coveredwith a second g ass sheet of the same size, and the sheets are pressed together, preferably over the entire surface, under a pressure of of an atmosphere.

Ewamplc Q The surfaces of a sheet of minpral glass, as described in Example 1, is covered with a coating of com letely polymerized amylenester of pheny '-acrylic acid, their. homologues or analogues, with an admixed corresponding monomer, which may result from incomplete polymerization, and a second sheet of glass is laid upon the coating and subjectedto "a certain pressure. The resulting article is then kept at room temperature, or heated to from to C. dependin upon the stability of the mineral lass use until the glass becomes optically omogeneous.

What is claimed as new is 1. As a new article of manufacture,

a lurality p ill! interposed layer of amylen-ester of polymers ized phenyl-acrylic acid, and exposing the connected sheets to sunli ht. 3. The recess of ma nonshatter 6 glass whic comprises covering a surface 0 a sheet of glass with a layer 0 amylen-eeter of polymerized phenyl-acrylic acid, exposing. the same to access of air andthereafter lacing a second sheet of glass a Inst said 10 ayt'lelr and pressing the sheets 0 glass toge er.

4. The recess of making nonshattering glass Whic comprises covering a surface 0 a sheet of lass with a coating of completely 1a polymerizefi phen l-acrylic acid with an a mixed correspon ing monomer, placing a second sheet of glass against said coatin and subjecting the same to pressure and an jecting the resulting article to substantially congo stant temperature until the glass becomes optically homogeneous. Si%ed at New York city in the county of New ork and State of New Yorkthis 12th day of January A. D. 1928.

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